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StupendousMan
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StupendousMan
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Yesterday,
10:42 PM
StupendousMan
replied to a thread
Will the gravity of Kepler-62e (1.6 x Earth) be stronger than Earth's?
in
Space/Astronomy Questions and Answers
I ran across a paper which provides detailed models of the mass and radius possibilities for rocky planets: ...
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19 replies | 257 view(s)
2013-May-20,
07:59 PM
StupendousMan
replied to a thread
Dark energy question.
in
Space/Astronomy Questions and Answers
Is gravity a force or not? If you are talking to people who are not graduate-level physicists, the most helpful answer is "yes". If you are talking...
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52 replies | 935 view(s)
2013-May-19,
12:54 AM
StupendousMan
replied to a thread
Converting B - V or V - I extinctions to visual magnitude at eyepiece
in
Space/Astronomy Questions and Answers
You can get a rough guess by equating the extinction perceived by human eyes to extinction in the V passband. In that case, the standard conversion...
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1 replies | 54 view(s)
2013-May-19,
12:49 AM
StupendousMan
replied to a thread
Best current extinction maps
in
Space/Astronomy Questions and Answers
Schlegel et al.'s maps are still the best general maps of extinction within the Milky Way, at least for the general case of a line of sight in some...
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3 replies | 91 view(s)
2013-May-17,
12:09 PM
StupendousMan
replied to a thread
Fun Papers In Arxiv
in
Astronomy
The neutrinos discussed in this paper are not detected directly at all. Their only purpose is to carry a significant amount of mass-energy past the...
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483 replies | 42746 view(s)
2013-May-11,
02:26 PM
StupendousMan
replied to a thread
Physics classes
in
Science and Technology
I've been teaching a mixed undergraduate/graduate course in extragalactic astronomy and cosmology this quarter. You can find the class materials at...
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8 replies | 260 view(s)
2013-May-11,
01:10 AM
StupendousMan
replied to a thread
Measuring the Gravitational Constant
in
Astronomy
One can claim, in exactly the same way, that all measurements of the value of c, the speed of light, have been done in laboratories on Earth. So...
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126 replies | 2377 view(s)
2013-May-10,
07:13 PM
StupendousMan
replied to a thread
Rayleigh scattering!
in
Space/Astronomy Questions and Answers
Rayleigh scattering of light by atoms and molecules will produce a sky which appears blue, because blue light is scattered more strongly the light...
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6 replies | 129 view(s)
2013-May-10,
12:22 PM
StupendousMan
replied to a thread
Cross section and grain size!!
in
Space/Astronomy Questions and Answers
Go to the page for this book, "Light scatting by small particles" http://books.google.com/books/about/Light_scattering.html?id=PlHfPMVAFRcC ...
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4 replies | 132 view(s)
2013-May-08,
03:09 PM
StupendousMan
replied to a thread
What are gravity wave detectors looking for?
in
Space/Astronomy Questions and Answers
Correct.
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29 replies | 529 view(s)
2013-May-08,
01:58 PM
StupendousMan
replied to a thread
Saturn's opposition surge.
in
Space/Astronomy Questions and Answers
That's certainly part of the explanation. Another part is the fact that at opposition, each little individual particle appears as a "full moon"...
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5 replies | 100 view(s)
2013-May-08,
12:40 PM
StupendousMan
replied to a thread
Saturn's opposition surge.
in
Space/Astronomy Questions and Answers
Good question. I didn't know the answer, so I'll tell you how I looked it up. First, I used the ADS abstract service ...
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5 replies | 100 view(s)
2013-May-07,
12:41 PM
StupendousMan
replied to a thread
Will Dark Matter Finally Reveal Itself?
in
Astronomy
It's not that hard to answer the question, "Did Carl Sagan do original research in the field of cosmology". Go to the ADS Abstract Service: ...
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187 replies | 5163 view(s)
2013-May-06,
09:32 PM
StupendousMan
replied to a thread
Will Dark Matter Finally Reveal Itself?
in
Astronomy
Please read a bit about George Lemaitre.
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187 replies | 5163 view(s)
2013-May-06,
07:38 PM
StupendousMan
replied to a thread
Will Dark Matter Finally Reveal Itself?
in
Astronomy
My point was that when Einstein developed his theory of general relativity, he found that the equations of GR predicted that (depending on the...
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187 replies | 5163 view(s)
2013-May-06,
04:58 PM
StupendousMan
replied to a thread
Will Dark Matter Finally Reveal Itself?
in
Astronomy
Please read about the history of the cosmological constant. Then come back and post here again.
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187 replies | 5163 view(s)
2013-May-05,
02:59 AM
StupendousMan
replied to a thread
What are gravity wave detectors looking for?
in
Space/Astronomy Questions and Answers
Your intuition is right! LIGO is most sensitive to waves with a frequency of 100-200 Hz. Just look at any of the graphs which appear on a search of...
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29 replies | 529 view(s)
2013-May-03,
02:25 PM
StupendousMan
replied to a thread
Will Dark Matter Finally Reveal Itself?
in
Astronomy
I didn't stay up late after scanning this paper. The author postulates that spiral arms are created when material is ejected from the centers of...
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187 replies | 5163 view(s)
2013-May-03,
12:23 PM
StupendousMan
replied to a thread
What are gravity wave detectors looking for?
in
Space/Astronomy Questions and Answers
The magnitude of the strain produced by a gravitational wave will decrease linearly with distance from the source. In other words, if a binary...
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29 replies | 529 view(s)
2013-May-02,
08:47 PM
StupendousMan
replied to a thread
What are gravity wave detectors looking for?
in
Space/Astronomy Questions and Answers
Let me be more careful: the gravitational wave detectors like LIGO are expecting to find _fractional_ changes in length of order 10^(-22). In other...
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29 replies | 529 view(s)
2013-May-02,
06:15 PM
StupendousMan
replied to a thread
accerating expansion and objects far far away
in
Space/Astronomy Questions and Answers
Statements 1 and 2 can be tested observationally. Both are consistent with the current data. I don't see how statement 3 can be tested...
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1 replies | 61 view(s)
2013-May-02,
06:11 PM
StupendousMan
replied to a thread
What are gravity wave detectors looking for?
in
Space/Astronomy Questions and Answers
Yes, the changes (in length) are of order 10^(-22) or so. It is extraordinarily difficult to detect such tiny effects, but people are getting closer...
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29 replies | 529 view(s)
2013-Apr-29,
09:30 PM
StupendousMan
replied to a thread
GRB 130427A - burst of the (quarter) century
in
Astronomy
Thanks very much to Don Alexander for bringing this to our attention! I'm teaching a course on extragalactic astronomy this quarter, and I've...
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66 replies | 4846 view(s)
2013-Apr-26,
12:00 PM
StupendousMan
replied to a thread
Anomalous Decelerations and Accelerations of Spacecraft
in
Against the Mainstream
Papers published in the last year indicate that thermal effects explain the observations. See http://adsabs.harvard.edu/abs/2012arXiv1211.6939B ...
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155 replies | 2749 view(s)
2013-Apr-23,
11:41 AM
StupendousMan
replied to a thread
View of point of umbra
in
Space/Astronomy Questions and Answers
For those wondering what a "hybrid eclipse" is, it's also (and more commonly) called an annular eclipse. The Moon is far enough from the Earth that...
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6 replies | 136 view(s)
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